Hi.Nowadays people say if we marry very close blood relations like a boy marrying his mom's brother's(uncle's) daughter, or in the paternal side like aunt's daughter there'll be a problem in the child's physique or mental disorders after birth or it may cause the death of the mother during delivery.Are all these myths? or true?If true are there any sort of preventive measures which can be taken during pregnancy such as tests, medicines etc.

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